Willis dodge



(No Model.) W DODGE.

BIT.

No. 494,251. Patented Mar. 28, 1893.

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UNITED STATES WILLIS DODGE, OF BLAINE, MAINE, ASSIGNOR OF ONE-HALFBUBAR, OF SAME PLACE.

PAT NT OFFICE.

TO JOHN H.

BIT.

SPECIFICATION forming part of Letters Patent No. 494,251, dated March28, 1893. Application filed February 16, 1892. Serial No. 421,724. (Nomodel.)

To all whom it may concern.-

Be it known that I, VVILLIS DODGE, a citizen of the United States,residing at Blaine, in the county of Aroostook and State of Maine, haveinvented a new and useful Bit, of which the following is aspecification.

My invention relates to improvements in angers or bits, the objects inview being to provide a bit which by its peculiar formation will obviateclogging, reduce friction between the spiral of the bit and the shavingor chip; and which will otherwise facilitate cutting.

Other objects and advantages of the invention will appear in thefollowing description, and the novel features thereof will beparticularly pointed out in the claims.

Referring to the drawings:Figures l and 2 are side elevations of a bitembodying my invention, the views being taken from opposite sidesthereof. Fig. 3 is an enlarged or exaggerated bottom plan view of thebit.

Like numerals of reference indicate like parts in all the figures of thedrawings.

1 denotes the shank of the bit or auger, 2 the spiral, and 3 the screwat the lower end of the latter. The shank, spiral and screw are all ofthe ordinary construction, my invention lying in the lower extremity ofthe spiral.

In practicing my invention, I employ the two cutting-edges 4 and 5, thelatter forming a continuation of the thread of the screw 3. Thecutting-edge 5 is what may be termed a drag or shear-edge, in that it isslightly rounded or curves rearwardly toward its outer end, from thedirection of rotation of the bit. This edge also inclines upwardly fromthe axis of the bit to its outer end, so that its cutting spur 6 iselevated above the point where the cutting-edge 5 meets the screw. Itwill thus be seen that the edge 5 will cut from the screw to a pointbarely beyond midway the same, the shaving being confined as produced tothe center of the spiral. The cutting-edge at, contrary to thedisposition given the cuttingsedge 5,is preferably straight, andradiates from the axial center of the screw and declines toward itsouter end. By this disposition given the edge 4, it will be seen thatthe shavingis cut from its outer end toward its center, thus completingthe removal of the shaving left remaining by the edge 5, and the shavingremoved by the cutting-edge 4 will be directed more toward the outeredge of the spiral, as will be obvious. From this it will be seen that Ihave provided an anger or hit, that is adapted to facilitate theoperation of boring by reducing the friction between the spiral and wallof the opening being formed, and furthermore by facilitating theentrance of the cutting-edges into the wood, and disposing the shavingsin such manner as to prevent choking.

Having described my invention, what I,

claim is 1. The herein-described improved boringtool, comprising theshank, spiral and screw, the said spiral terminating at opposite sidesof the screw in cutting-edges, one of which inclines from the screw toits outer end, and the other of which declines from the screw toward itsouter end, substantially as specified.

2. The herein-described improved boringtool, the same consisting of theshank, a spiral and a screw, the spiral terminating at opposite sides ofthe screw in cutting edges, one of which inclines from the screw to itsouter end and is slightly curved opposite to the direction of movementof the tool, and the other of which declines from the screw to its outerend, substantially as specified. I

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

WILLIS DODGE.

Witnesses:

E S. LOWELL, J. M. RAMSEY.

